nrf5340 is unable to trigger rpmsg(ipc) transfer

[Dumam]

Hi,

I have quite demanding SPI device which should send its data over BLE.
Thanks to throughput example i was able to achieve maximum transfer speeds for synthetic tests (without SPI).
Sadly after adding real data input, I noticed that no transfer is executed until I finish my commands. 

Thanks to SystemView I was able to narrow this problem to one part of configuration -> rpmsg.

Colors:

Green -> spi thread
Yellow -> bt_hci thread
Orange -> ble host TX
Red (small squere in top) - IRQ 58 from probably ipc, but i wasnt able to find it in manual (not listed)
Blue - probably openAmp mailing work queue thread
purple - systemwork queue

SystemView Data Log
4010.BleProblem.dat

Here is repo with configs etc.
https://github.com/DuMaM/bitly_nrf5x

[Dumam]

[00:01:23.903,991] <dbg> bt_hci_driver: bt_rpmsg_rx: RX buf payload:
                                      02 00 20 07 00                                   |.. ..
[00:01:23.999,847] <inf> main: === Reseting data buffer ===
[00:01:24.001,159] <inf> ads129x_log: Data transfer enabled
[00:01:24.001,220] <inf> main: === Start analog data transfer ===
[00:01:24.001,220] <inf> main: Sending 126 bytes (value after rounding to max packet size)
[00:01:24.003,784] <dbg> bt_hci_driver: bt_rpmsg_send: buf 0x20019a88 type 2 len 137
[00:01:24.003,906] <dbg> bt_hci_driver: bt_rpmsg_send: Final HCI buffer:
                                        02 00 00 85 00 81 00 04  00 52 12 00 00 00 01 c0 |........ .R......
                                        00 00 01 a6 f7 f5 c3 eb  ff fd 22 ff f6 bf ff f6 |........ ..".....
                                        de ff f7 54 ff f6 cd ff  fa ff f5 c6 c9 05 1f 79 |...T.... .......y
                                        05 1c 9b 05 1c 9b 00 00  01 c0 00 00 01 a6 ac f5 |........ ........
                                        d0 59 ff fd 2b ff f6 cf  ff f6 d4 ff f7 41 ff f6 |.Y..+... .....A..
                                        c5 ff fb 1f f5 d3 2e 05  19 3e 05 16 69 05 16 69 |........ .>..i..i
                                        00 00 02 c0 00 00 01 a5  e6 f5 d2 54 ff fd 1f ff |........ ...T....
                                        f6 e1 ff f6 c4 ff f7 31  ff f6 ae ff fb 22 f5 d5 |.......1 ....."..
                                        35 05 18 46 05 15 65 05  15 65                   |5..F..e. .e
[00:01:24.004,119] <inf> main: [local] sent 126 bytes (0 KB) in 3 ms at 336 kbps
[00:01:24.005,676] <inf> ads129x_log: Data transfer disabled
[00:01:24.005,889] <dbg> bt_hci_driver: bt_rpmsg_send: buf 0x20019a88 type 2 len 11
[00:01:24.005,920] <dbg> bt_hci_driver: bt_rpmsg_send: Final HCI buffer:
                                        02 00 00 07 00 03 00 04  00 0a 12 00             |........ ....
[00:01:24.011,444] <dbg> bt_hci_driver: bt_rpmsg_rx: RPMsg data:
                                        04 13 05 01 00 00 01 00                          |........
[00:01:24.011,474] <dbg> bt_hci_driver: bt_rpmsg_evt_recv: len 5
[00:01:24.011,505] <dbg> bt_hci_driver: bt_rpmsg_rx: Calling bt_recv(0x20019758)
[00:01:24.011,810] <dbg> bt_hci_driver: bt_rpmsg_rx: RX buf payload:
                                        04 00 00 00 e1                                   |.....
[00:01:24.011,993] <dbg> bt_hci_driver: bt_rpmsg_rx: RPMsg data:
                                        04 13 05 01 00 00 01 00                          |........
[00:01:24.012,084] <dbg> bt_hci_driver: bt_rpmsg_evt_recv: len 5
[00:01:24.012,115] <dbg> bt_hci_driver: bt_rpmsg_rx: Calling bt_recv(0x20019758)
[00:01:24.012,451] <dbg> bt_hci_driver: bt_rpmsg_rx: RX buf payload:
                                        42 00 00 00 ac                                   |B....
[00:01:24.043,762] <dbg> bt_hci_driver: bt_rpmsg_rx: RPMsg data:
                                        02 00 20 15 00 11 00 04  00 0b 01 00 00 00 7e 00 |.. ..... ......~.
                                        00 00 87 24 00 00 ff ff  ff ff                   |...$.... ..
[00:01:24.043,792] <dbg> bt_hci_driver: bt_rpmsg_acl_recv: len 21
[00:01:24.043,823] <dbg> bt_hci_driver: bt_rpmsg_rx: Calling bt_recv(0x200197c8)
[00:01:24.043,914] <inf> main: [peer] received 126 bytes (0 KB) in 1 GATT writes at 9 kbps
[00:01:24.044,006] <dbg> bt_hci_driver: bt_rpmsg_send: buf 0x20019970 type 0 len 8
[00:01:24.044,036] <dbg> bt_hci_driver: bt_rpmsg_send: Final HCI buffer:
                                        01 35 0c 05 01 00 00 01  00                      |.5...... .
[00:01:24.044,250] <dbg> bt_hci_driver: bt_rpmsg_rx: RX buf payload:
                                        e2 ae 03 00 88 9a 01 20  02 00 00 00 0f 00 00 00 |.......  ........
[00:01:24.044,372] <inf> main:

Here is a debug log from rpmsg. 

I send 100 bytes with write ble command. The final hci buffer was ok 137 bytes.
Sadly there is quite long response from NETWORK, which makes it unusable